Wet desulfurization and decarbonization are common gas purification technologies. It is applied in natural gas reforming gas purification, coal gasification combined gas purification, LNG production process with coke oven gas, SNG process. MDEA process is used for H2S and CO2 removal. After purification of syngas: H2S<10mg/Nm ³, CO2<50ppm (LNG process).
Parameter |
Value |
|---|---|
|
Plant scale |
Processing natural gas or shift gas 1000~20000 Nm3/h |
|
Decarburization accuracy |
CO2≤20ppm |
|
Desulfurization accuracy |
H2S≤5ppm
|
|
working pressure |
0.5~15 MPa（G） |
The synthetic gas enters the reboiler of the regeneration tower at 170 ℃ and is cooled by water after heat exchange. The temperature drops to 40 ℃ and enters the decarbonization tower. The synthetic gas enters from the bottom of the tower, the amine liquid is sprayed from the top, the gas passes through the absorption tower from the bottom to the top, the CO2 in the gas is absorbed, and the decarburized gas goes to the next process for hydrogen extraction, and the CO2 content of the decarburized gas is controlled at 50 ppm~2%. After the amine liquid passes through the decarbonization tower, the lean liquid absorbs CO2 and becomes rich liquid. After exchanging heat with the lean liquid at the outlet of the regeneration tower, it enters the regeneration tower for stripping, and the CO2 gas flows from the tower top to the battery limit. Amine liquid is heated by reboiler at the bottom of the tower to remove CO2 and become lean liquid. The lean liquid flows out from the bottom of the regeneration tower, passes through pressurization, lean and rich liquid heat exchanger and lean liquid cooler for cooling, and returns to the decarbonization tower to absorb the acid gas CO2.
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